Emery-wheel bench-grinder.



J. F. PRIBNOW. EMERY WHEEL BENCH GRINDER. APPLICATION FILED OCT. 21,1912.

Patented Dec. 16, 1913.

2 SHEETS-SHBET 1.

flrngy COLUMBIA PLANDGRAPH COHWASHINUTONI 07c.

J. F. PRIBNOWQ EMERY WHEEL BENCH GRINDER.

APPLICATION FILED 0GT.21,1912.

Patented Dec. 16, 1913.

2 SHEET8-SHEET 2.

JOHN F. PBIBNOW, OF MELLEN, WISCONSIN.

EMERY-WHEEL BENCH- GRINDER.

Specification of Letters Patent.

Patented Dec. 16,1913.

Application filed October 21, 1912. Serial No. 726,902.

To all 107mm {6' may concern Be it known that I, JOHN F. Fmexow, acitizen of the United States, residing at Idellen, in the county ofAshland and State of lVisconsin, have invented a new and usefulEmery-lVheel Bench-Grinder, of which the following is a specification.

It is the fundamental object of my inven tion to provide a grinder inwhich the abrasive wheel, such as an emery wheel, may be mounted on itsshaft or arbor and removed therefrom without requiring any specialtools, and when mounted on the shaft will always run true regardless ofhow often it has been removed.

It is my further object to provide a protective hood which can beadjusted to provide for the wearing down of the abrasive wheel and toaccommodate varieties of work, and may be swung back to allow the readyremoval or replacement of the wheel.

Further objects will appear hereinafter.

The accompanying drawings illustrate my invention.

Figure 1 is a front elevation of a grinder embodying my invention; Fig.2 a plan view of the grinder shown in Fig. 1; Fig. 3 a section on line33 of Fig. 1; Fig. 4 an en larged detail, partly in section, showing themounting of the abrasive wheel on the shaft or arbor; Fig. 5 an enlargedsection on line 55 of Fig. 3; Fig. 6 a perspective view of the releasingand tightening pawl; Fig. 7 a detail of the pawl spring; Fig. 8 a frontelevation of the driving pulley, showing the lugs for cooperating withthe pawl; Fig. 9 a section on the line 99 of Fig. 8; Fig. 10 a crosssection through one of the bearings, taken on the line 1010 of Fig. 11;Fig. 11 a section on line 1111 of Fig. 10; Fig. 12 a partial plan viewshowing the mounting of the protective hood; and Fig. 13 a detail of thesupporting bolt on which the protective hood is mounted.

The shaft or arbor 10 is rotatably mounted in bearings 11 on a suitableframe 12, the bearing caps 13 being provided with clamping screws 1 1-and spacing screws 15 whereby they may be accurately adjusted to theshaft 10. On each projecting end of the shaft 10 an abrasive wheel maybe removably mounted. In order to insure trueness in these abrasivewheels, no matter how often they are removed and replaced, each suchwheel is mounted on a metal sleeve 21 provided with a flange 22 betweenwhich and a clamping plate 23 screwed on to the end of the sleeve 21 thewheel 20 is permanently clamped, being held between the flange 22 andthe clamping plate 23 until it is worn out and ready to be discarded.The sleeve 21 1s screw-threaded internally to cooperate with an externalscrew thread 2 1 on the end of the shaft 10, which is provided near eachend with a shoulder 25 against which the sleeve 21 abuts when it isscrewed on to the end of the shaft.

Between the two bearings 11 is mounted the driving means for the shaft10. In the arrangement illustrated this comprises a pulley fixedlymounted on such shaft, as by a lVoodruff key 31. The pulley isconveniently provided at one end with an extension 33, a loose collar3-1 being fastened to the shaft near the other end of the pulley by aset screw 32 and providing a convenient means for taking up the end playof the shaft. This extension 33 and the collar 34c project over theadjacent ends of the bearings 11 and bearing caps 13 and serve asdustproof coverings therefor. Each sleeve 21 may have a similarprojection 35 to protect the adjacent end of the bearing 11. Theextension 33 of the pulley 30 is cut away as shown in Fig. 9 to form oneor more radially projecting lugs 36. An arm or pawl 37 is pivoted on apin 38 extending into one of the pedestals for a bearing 11, a spring 39surrounding the pin 38 and being seated within a pocket 40 on the arm 37to keep the latter from accidental movement and from rattling. The arm37 has a projection 41 in the same plane as the lugs 36. By raising thearm 37, projection 11 is swung into the circle in which the lugs 36rotate, so that it engages such lugs in their rotation. By thus raisingthe arm 37 and turning the wheel 20 by hand in the desired direction,the lug 41 engages a lug 36 and suddenly arrests the movement of theshaft 10, while the momentum of the wheel 20 jars it firmly against orfrom the shoulder 25 and thus into or out ofplace. This provides formounting and dismounting the abrasive wheel without the use of specialtools.

For safety purposes, a protective hood 415 is provided for each emerywheel. The hood 45 is pivotally mounted on a bolt 46 which extendsthrough a slot 47 in a projection 18 from the back of the adjacentbearing pedestal, and is provided with a lateral lug 49 through which ascrew 50 extends so that it may rest on the top of the projection 48. Byloosening the bolt 46 the hood may be swung from over the abrasive wheel20 to allow the latter to be removed or replaced, the slot 47 alsoproviding for adjusting the distance of the front end of the hood fromthe surface of the abrasive wheel to accommodate different kinds of workand to compensate for the wearing away of the abrasive wheel. By meansof the screw 50, the width of the opening through which the work isapplied to the wheel, may be adjusted. Each bearing pedestal may alsohave a forward projection 55,-which is vertically slotted to receive aclamping bolt 56 for holding the longitudinally slotted work table 57.The nut cooperating with each bolt 56 preferably has a hexagonal part 58for the reception of a wrench and a thumb screw part 59 for handmanipulation. The work table 57 preferably has an extension along theside of the abrasive wheel, which extension may take the form of anintegral part 60 as shown at the left of Fig. 2 or of a sliding table 61slidably mounted on a T end 62 of the work table 57. The sliding table61 may be provided with a cross slide 63 on which is mounted aprotractor 64: carrying a guide 65 for holding the work at any desiredangle relative to the side of the wheel 20.

I claim as my invention:

1. A grinding device, comprising an abrasive wheel, an internallythreaded sleeve on which said wheel is permanently mounted, a threadedshaft upon which said sleeve may be removably mounted, said sleeve andsaid shaft being provided with engaging shoulders for locking the twotogether against accidental displacement, a projecting lug carried bysaid shaft, and a movable pawl which may be moved into and out of thepath of movement of said lug to cooperate therewith to produce a suddenstoppage of the shaft.

2. A grinding device, comprising an abrasive wheel, a flanged sleeveextending through said wheel with the flange bearing against the sidethereof, and a clampin plate screw-mounted on said sleeve an bearingagainst the other side of said wheel to clamp the latter between it andthe flange on the sleeve, said sleeve being internally screw-threadedand provided with a shoulder, in combination with a screw-threaded shaftupon which said sleeve may be threaded, said shaft being provided with ashoul= der for cooperating with the shoulder on the sleeve to lock thesleeve and shaft together, a projecting 11w carried by said shaft, and amovable pawl which may be moved into and out of the path of movement ofsaid lug to cooperate therewith to produce a sudden stoppage of theshaft to force said two shoulders together or apart by the momentum ofthe sleeve and wheel.

In witness whereof, I, have hereunto set my hand and seal at Mellen,/visconsin, this 12th day of October, A. D. one thousand nine hundredand twelve.

JOHN F. PRIBNOWV. [1 s] Witnesses:

M. J. DONAHUE, EARL C. PoUNDsroNE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, 1). c. l

